Sound-recording apparatus.



J. NULL.

SOUND RECORDING APPARATUS.

APPLICATION FILED FEB. 3, 1914,

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JOHN NULL, OF NEW YORK, N. Y., ASSIGNO'R To AMERICAN TELEPHONOGRAPH COR- PORATION, 0F WILMINGTON, DELAVIARE,

A CORPORATION OF DELAWARE.

SOUND-RECORDING APPARATUS.

Specification of Letters Patent.

Patented Nov. 24, 1914.

Application filed February 3, 1914. Serial No. 816,158.

To all whom it may concern Be it known that I, J OHN NoLL, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Sound-Recording Apparatus, of which the following is a specification.

My invention relates to electrically controlled sound recording apparatus whereby a message may be automatically recorded at a telephone station, and. my object is to provide .a means whereby the operator at the central otlice may supervise the entire operation of the sound recordingapparatus. The

means whereby I accomplish this result consist, broadly, of a polarized relay at the telephone station, the movements of the relay operating to start or stop the driving mechanism which actuates the recording cylinder and the recorder. Simultaneously with the movement of the relay the recorder is connected to or disconnected fromthe telephone circuit. A means is provided at the central otlice whereby the operator can control the movement of the relay, a signal indicating instantly to the operator whether or not the controlling circuit is operative. The recording circuit is, by the operation of the polarized relay, connected to or disconnected from the talking circuit, a signal in the cord circuit instantly notifying the operator at the central office whether the recorder is connected or disconnected.

In the accompanying drawing, the figure is a view in elevation of the entire apparatus.

A polarized relay 2 is rovided at a telephone station 3, one 0 the purposes of said relay being to control the mechanism indicated at 6, 8,9 and 10, which actuates the recording cylinder 7 and the recorder 1, as hereinafter more fully described.

The armature 2*, pivotally mounted at 2, is adapted to close the motor circuit when placed in operative position, the current starting from batteries 4 and passing through the motor 6 to contact 2, to its adjacent contact 2 of relay 2, and back to the batteries 4:. The above described circuit actuates the motor 6 which, by means of the pulley 8, belt 9 and driving ulley 10, operates the recording cylinder 7 and the recorder 1. Simultaneously with the action of the armature 2 and of the controlling circuit contacts 2 and 2 the swinging contacts 2 2, 2 and 2 connect the recording circuit with recorder 1 to the telephone circuit at the points 55 and 5". The 'recorder 1 having been connected across the telephone circuits'at the points 5 and 5, the recording cylinder 7 may be incised by sound vibrations. a signal 29 in the cord circuit at the central ofiice notifying the operator that the recorder 1 is in circuit in the talking circuit, as hereinafter more fully described.

The operation of the polarized relay 2 is controlled by the movements of two switches 11 and 12. The armature 2 of relay2 is rendered operative by a positive current controlled by the switch 11.

A. ground 13 is connected to the negative side of the batteries 11, the positive side of said batteries being connected to the signal 15, to a contact 11*, toits adjacent contact 11 of switch 11, to the tip 16 of the connecting plug 16, to the adjacent contact 17*" Said connection operates nected to the signal 21, to the contact 12, to

itsadjacent contact 12 of switch 12, to the contact 11, to its adjacent contact 11 of switch 11, to the tip 16 of the connecting plug 16, to the adjacent contact 17 of jack 17, connecting at the point 18 to the winding of the relay 2 and thence to the ground 19.

The operatorsconnecting cord circuit is of the common battery type, comprising batteries 40 grounded at 22 and connected to the negative side of the batteries 40 and to repeating coils 24 and 25 at the points :23 and 26. When the operator places the plug 16 in the jack 17 the talking circuit of the plug 16 'and 16 is connected to its adjacent contacts 17 and 17 of the jack 17. The

signal circuit is connected at the sleeve 16 of the plug 16 to the sleeve 17 c of the jack 17 ings of the repeating coil 25 to relay 38 through the contacts 12 and 12 of switch 12, through the contacts 11 and ll of switch 11 to the ring 16 to its adjacent contact 17 to the point of connection 5*, to the contact 2 to its adjacent contact 2 of relay 2, through the winding of the recorder 1, back to the contact 2 to the contact 17, to its adjacent contact 16 tov the contact 11", to its adjacent contact 11 of switch 11, to contact 12', to its adjacent contact 12 of switch 12, to one of the windings of the resaeating coil 24, and back to the batteries 40.

imultaneously with the connection of the plug to the jack a signal current passes from the batteries 40 to the point of connection 27, tea resistance coil 28, to the'lamp 29, to the sleeve of the plug 16, to the sleeve of the jack ,17", and to the ground 30. The current passing through the lamp 29 illuminates it. When the recorder circuit has been closed by relay 2, the current of the talking circuit closes relay 38, closing con tacts 38 and 38 The closing of these contacts shunts the current from the lamp 29 through a lower resistance than the lamp 31. The action of the remaining half of the cord circuit is identical with that hereinbefore described, with the exception of the function of switches 11 and 12. The current from batteries 40passes through one of the windings of the repeating coil 25 to the relay 41, to the ring. 32*- of the plug 32, through an external circuit back to the tip 32 of the plug 32, to the winding of the repeating coil 2st and thence to the batteries 40. Simultaneously with the con nection of plug 32 the current passes from the batteries 40 to the connection 27, to a resistance 33, to the lamp- 34, to the sleeve 32 of plug 32 and thence to a ground in the external circuit. When'the relay 4:1 is actuated by closing an external circuit through the ring 32 and tip 32 of the plug 32 the contacts 35 and 26 close, shunting lamp 34: through the resistance 37 4 The apparatus hereinabove described accomplishes two results. The sound recording mechanism, comprising the recorder, recording cylinder and the motor for actuating the same is installed in the office of Liiaaie party A. Party B, desiring to record a mes sage thereon, calls the central oflice operator from a telephone station. The operator thereupon -makes the requisite connection for actuating the recorder through its motor, the signal lampsindicating to the operator when such connection is established and likewise indicating the disconnection upon completion of the message transmitted by party A.

Having thus described -my invention, I claim:

1. In an electrically actuated sound re cording apparatus, a sound recording mechanism, comprising a recorderand recording cylinder and means for actuating the same, means for electrically controlling said sound recording mechanism, and means for indicating the connection and disconnection of the circuits controlling the operation of said sound recording mechanism, substantially as described.

2. In an electrically actuated sound recording apparatus, the combination of an electrical recorder, a recording surface adapted to register the impulse transmitted to said recorder, a relay adapted to control the action of said recording mechanism, and a plurality of connecting plugs, one of which is connected to said relay and adapted to be actuated by a starting and stopping JOHN Nome.

said plugs,

I/Vitnesses:

EUGENE DELMAR, E. C. Muesli/ren 

